cos 60=(1-2 sin ²30)=(2 cos ² 30-1)
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Answered by
2
Answer:
step1:cos 60°=1/2
step2:(1-2sin^2 30°)
putting value of 30°
=(1-1/2)
=1/2
step3:(2cos^2 30°-1)
=2 (1-sin^2 30°)-1
=2-2sin^2 30°-1
=1-2sin^2 30°
=1/2
value of all are same
so they are equal.
Step-by-step explanation:
Hope it will help you Mark it brainlist. ...
Answered by
1
Answer:
Answer:
step1:cos 60°=1/2
step2:(1-2sin^2 30°)
putting value of 30°
=(1-1/2)
=1/2
step3:(2cos^2 30°-1)
=2 (1-sin^2 30°)-1
=2-2sin^2 30°-1
=1-2sin^2 30°
=1/2
value of all are same
so they are equal.
Step-by-step explanation:
Hope it will help you Mark it brainlist. ...
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